03-13-2013
Hardware RAID0 is always faster than a single disk because you can step the reads and writes across the two disks simultaneously. However, I have never come across a case where throughput was doubled. Typically you will get something like a 50% increase in throughput.
Software RAID0 can provide throughput improvement but typically less than hardware RAID0.
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Hi
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LEARN ABOUT DEBIAN
kumostat
KUMOSTAT(1) General Commands Manual KUMOSTAT(1)
NAME
kumostat - get kumofs status
SYNOPSIS
kumostat server-address[:port=19800] command
kumostat -m manager-address[:port=19700] command
DESCRIPTION
Get status from Server node.
COMMANDS
pid get pid of server process
uptime get uptime
time get UNIX time
version
get version
cmd_get
get total number of processed get requests
cmd_set
get total number of processed set requests
cmd_delete
get total number of processed delete requests
items get number of stored items
rhs get rhs (routing table for Get)
whs get whs (routing table for Set/Delete)
hscheck
check if rhs == whs
set_delay
maximize throughput at the expense of latency
unset_delay
maximize throughput at the expense of latency
DELAY MODE
If the delay mode is enabled, req/sec throughput is maximized at the expense of latency. This mode actually disables TCP_NODELAY option of
all sockets. The practice of this feature is as following:
- run some scripts that watches load of the kumo-server. (see source code of kumotop)
- if the load of kumo-server becomes high, enable delay mode by kumostat set_delay command.
- if the load of kumo-server becomes low, disable delay mode by kumostat unset_delay command.
EXAMPLE
$ kumostat svr1 items
$ kumotop -m mgr1 hscheck
SEE ALSO
kumo-server(1).
kumostat July 2009 KUMOSTAT(1)